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For every watt of power that is charged into a battery, you only get a fraction back out. That watt required energy to create it. That is in big part why electric powered cars and not as efficient as the tree huggers might lead you to believe.
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Case in point, the statement in the above post. Batteries are 90% efficient? At first I thought that was BS, but it's on the internet so it must be true
They are probably talking about how much energy is actually stored vs. released, not how much energy it takes to charge the batteries vs. how much is relleased.